The European Hoverfly or Dronefly is an accidental introduction to the Falklands that has become established. It resembles a honey bee but is completely harmless and unable to sting
Eristalis tenax is a European hoverfly, also known as the drone fly (or “dronefly”).
The larva of E. tenax is a rat-tailed maggot. It lives in drainage ditches, pools around manure piles, sewage, and similar places containing water badly polluted with organic matter. The larva likely feeds on the abundant bacteria living in these places.
When fully grown, the larva creeps out into drier habitats and seeks a suitable place to pupate. In doing so it sometimes enters buildings, especially barns and basements on farms. The pupa is 10–12 mm long, grey-brown, oval, and retains the long tail; it looks like a tiny mouse.
The adult fly that emerges from the pupa is harmless. It looks somewhat like a drone honey bee, and likely gains some degree of protection from this resemblance to a stinging insect. The adults are called drone flies because of this resemblance. In its natural habitat, E. tenax is more of a curiosity than a problem. Like other hover flies, they are common visitors to flowers, especially in late summer and autumn, and can be significant pollinators.
Large (wingspan 15mm), stocky, bee mimic. Eyes are marbled in black. Males have hovering displays.
Adults feed on flowers, especially those of carrot and fennel.